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vfs: separate FMODE_PREAD/FMODE_PWRITE into separate flags
Separate FMODE_PREAD and FMODE_PWRITE into separate flags to reflect the reality that the read and write paths may have independent restrictions. A git grep verifies that these flags are always cleared together so this new behavior will only apply to interfaces that change to clear flags individually. This is required for "seq_file: properly cope with pread", a post-2.6.25 regression fix. [akpm@linux-foundation.org: add comment] Signed-off-by: Paul Turner <pjt@google.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@kernel.org> [2.6.25.x, 2.6.26.x, 2.6.27.x, 2.6.28.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 12 additions and 6 deletions
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@ -54,24 +54,30 @@ struct inodes_stat_t {
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#define MAY_ACCESS 16
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#define MAY_OPEN 32
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/*
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* flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
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* to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
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*/
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/* file is open for reading */
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#define FMODE_READ ((__force fmode_t)1)
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/* file is open for writing */
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#define FMODE_WRITE ((__force fmode_t)2)
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/* file is seekable */
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#define FMODE_LSEEK ((__force fmode_t)4)
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/* file can be accessed using pread/pwrite */
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/* file can be accessed using pread */
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#define FMODE_PREAD ((__force fmode_t)8)
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#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
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/* file can be accessed using pwrite */
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#define FMODE_PWRITE ((__force fmode_t)16)
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/* File is opened for execution with sys_execve / sys_uselib */
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#define FMODE_EXEC ((__force fmode_t)16)
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#define FMODE_EXEC ((__force fmode_t)32)
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/* File is opened with O_NDELAY (only set for block devices) */
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#define FMODE_NDELAY ((__force fmode_t)32)
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#define FMODE_NDELAY ((__force fmode_t)64)
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/* File is opened with O_EXCL (only set for block devices) */
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#define FMODE_EXCL ((__force fmode_t)64)
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#define FMODE_EXCL ((__force fmode_t)128)
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/* File is opened using open(.., 3, ..) and is writeable only for ioctls
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(specialy hack for floppy.c) */
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#define FMODE_WRITE_IOCTL ((__force fmode_t)128)
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#define FMODE_WRITE_IOCTL ((__force fmode_t)256)
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/*
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* Don't update ctime and mtime.
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